摘要
以Ti粉、Al粉为基本组分,通过添加Nb2O5,于1220℃/30min烧结后在Ti-Al基内原位合成Al2O3晶须,借助XRD、SEM以及EDS研究产物组成和Al2O3晶须形貌,并讨论晶须的生长机制。结果表明,无Nb2O5时,除铝剩余外,还形成TiAl3和Al2O3相,Al2O3短晶须分布在孔洞区域。加入10wt%Nb2O5后,产物由TiAl3、Al2O3和NbAl3相组成,Al的衍射峰基本消失,基体内形成大量的Al2O3晶须,直径约为30～90nm。根据晶须顶端的圆珠小球,Al2O3晶须主要以VLS机制生长。
Al2O3 whiskers were successfully synthesized by in-situ reaction at 1220℃ for 30min using Ti powders and Al powders as starting materials with Nb2O5 additive.The effects of Nb2O5 additive on the composition and Al2O3 morphologies of the products were characterized by means of XRD,SEM and EDS.The growth mechanism of the Al2O3 whiskers was also analyzed.Without Nb2O5 additive,the product is consisted of TiAl3,Al2O3 and remainder Al phase.Al2O3 whiskers grow in the pores and develop imperfect.With 10wt% Nb2O5 additive,the diffraction peaks of Al disappear,the product includes TiAl3 and Al2O3 as the major phases,as well as NbAl3 phase.It appears a larger number of Al2O3 whiskers in the pores with diameters ranging from 30nm to 90nm.Growth mechanism of Al2O3 whiskers is vapor-liquid-solid reaction mechanism according to the appearance of the small galls on the top of the whiskers.
出处
《中国陶瓷》
CAS
CSCD
北大核心
2010年第10期34-36,共3页
China Ceramics
基金
陕西省自然科学基金资助项目
编号:2008E120
陕西理工学院省级研究基地培育项目
编号:SLGJD0806
